According to a recent interview with Tyrese Gibson regarding the future of Transformers 4, he can only say that there are no hints and plot yet which had been discussed. He also says that in case Michael Bay decides not to come back for Transformers 4, there is that possibility that Steven Spielberg will be directing the next film.
Spielberg by the way is one of the biggest and most respected directors in the worlds who also happens to be the Executive Producer of Transformers.
The bad news isn't over too because Shia LaBeouf had also confirmed that Transformers 3: Dark of the Moon would be his last in the series.
So what do you think? Any plot ideas for Transformers 4?